Joseph



(No Model.) J.'U, HENDERSON.

, ChimneyVen'tilator. 7 No. 232.642. Patented Sept. 28,1880.

1 UNITED STATES;

PATENT OFFICE.

- JOSEPH o. HENDERSON, OF TROY, NEW YORK.

GH'I MNEY-VENTI LATO R.

SPECIFICATION forming part of Letters Patent No. 232,642, datedSeptember 28, 1880.

Application filed March 23, 1880. (No model.)

To all whom it may concern 7 Be it known that I, JOSEPH O. HENDERSON, ofthe city of Troy, county of Rensselaer, and State of New-York, haveinvented a new and useful Improvement in Ventilators, and of whichthefollowing is a specification. 7

My invention relates to improvements in that class of ventilators whichis used upon chimney-tops and the exterior ends of flues andventilator-pipes and it consists, as hereinafter described, in a mannerof combining with the ordinary deflecting-apron surrounding the egresstop opening of the ventilatorpipe an interior pipe, which, at its egressend, is contractedto taper inwardly, so as to form around the end thuscontracted and between its exterior surface and the top edge of thetapering apron an annular current-deflecting passage.

The object of my invention is to provide a passage-way between the rimof the egressopening at the top of the deflecting-apron and the top edgeof the ventilating-pipe, so that the eddyingcurrent produced upon andover the edge of the latter by the exterior wind force will curl downinto the annular passage instead of into and against the egress-currentof the ventilating-pipe, as it does where the latter and apron unite inan acute angle around the top of the pipe.

In the accompanying drawings, forming a part of this specification,there are three figures illustrating my improvement, in all of which thesame letters are employed upon the sameparts of the device.

Figure 1 shows an elevation of a ventilator to which my improvement hasbeen added, and exteriorly illustrating the position of the innercontracted egress end of the exit pipe and its position relatively tothe top of the apron. Fig. 2 shows a section taken vertically throughthe center of the ventilator, with the contracted end of theegress-pipeformed within the inside of the apron-top rim and also insideof the vertical continuation of the straight side of the pipe, so as toform an annular opening between the contracted egress-pipe and the toprim of the apron, showing, also, by arrows the direction of the eddycurrent produced by the lateral wind force against and over the upperrim of the deflecting-apron.

Fig. 3 shows a modification of the same ventilator, in which the annularopening is formed in the same manner by contracting the exitpipe at itsegress-top, but with the vertical extension of the straight part of thepipe from where the contraction commences, as shown in Fig. 2, removed,and the apron connected with the contracted pipe bytransversely-arranged connecting-braces.

The several parts of the device are designated by letter reference anddescribedas follows:

The letter P indicates the cap, having the usual form of a flattenedcone, and if desired this may be made flat.

B designates the apron, which is of the ordinary deflecting formemployed in ventilators of the class to which my invention isapplicable.

0 indicates the straight portion of the ventilator-pipe, to which, asusually made, the deflecting-apron is attached at the top on an angle,as shown at O O.

The letter D designates a contracted outletpipe, which tapers inwardlyand upwardly, as shown, and so as to form between its top rim and thetop rim of the deflecting-apron the annular passage or opening at m.

At I I are shown apertures for the passage of the curling eddy currentcoming over the rim of the apron-top.

The letters F F indicate the vertical supports connecting the cap withthe apron.

While I have shown the pipe D as projected a little above the top rim ofthe apron, I do not desire to make its upward extension in.

this respect an arbitrary condition of my invention, for the annularopening will perform the same office in the same manner whether the topof the pipe be slightly above the apronriin won a level with it.

When the wind is blowing laterally against the ventilator side thecurrent deflected upwardly by the apron forms an eddy current, whichcurls over its edge into the annular opening; but were the apron-rim, atits top, connected with the top of the pipe this eddy would curl overthe edge of the latter and into the emerging ventilating-current, tointerfere in a measure with its delivery-passage.

I am well aware that myinvention is lim- IOO ited to an improvement uponan older device, in which, by reconstruction and form, a new factor (theannular opening) is added, by which a defect existing in the olderdevice is re 5 moved.

Having thus described my invention, what I claim and desire to secure byLetters Patent,

In a ventilator, the combination of the cap 10 I. suspendeddeflecting-apron B, ventilatorpipe 0, and exit-pipe D, the latter beingsmaller in its diameter at the top than the top diameter of theapron-rim, with the annular openings an arranged between the top of theegresspipe and top rim of the apron, substantially I 5 as and for thepurposes described.

Signed at Troy, New York, this 20th day of March, A. D. 1880.

J. O. HENDERSON.

Witnesses:

CLARENCE B. CUTLER, GEO. TIMMINS.

